| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 20 |
0.2%
|
|
| 1991 | 622 |
5.3%
|
|
| 1992 | 859 |
7.4%
|
|
| 1993 | 721 |
6.2%
|
|
| 1994 | 874 |
7.5%
|
|
| 1995 | 852 |
7.3%
|
|
| 1996 | 1106 |
9.5%
|
|
| 1997 | 855 |
7.3%
|
|
| 1998 | 875 |
7.5%
|
|
| 1999 | 924 |
7.9%
|
|
| 2000 | 1145 |
9.8%
|
|
| 2001 | 928 |
8%
|
|
| 2002 | 1081 |
9.3%
|
|
| 2003 | 802 |
6.9%
|